The total size of the man cave complex is currently 32x35', 1120 sq ft. I started with a Trion electronic smoke eater. This was supposedly extremely powerful and did very little. After talking with a lot of bar owners, they all had the same answer, add more heat and a/c and just draw fresh air from the outside and vent ceiling out just like a bathroom. I used a pretty large vent fan. It is super quiet and very powerful. It will completely get rid of all smoke and smell within 24 hours. I run it on high while I smoke. About an hour after smoking, I turn it down to about 1/4 power and let it run for 20 hours or so. It is amazing.
Avoid filters and electronic filters, they will not do much at all. I spent over $1000 on the Trion and it did virtually nothing. I spent 200 on the exhaust fan and it is amazing.